Semi-automatic perpetual calendar



Nov. 20, 1956 K. o. SCHMIDT 2,770,902

SEMI-AUTQMATIC PREPETUAL. CALENDAR Filed Jan. 24, 1955 2 2 Sheets-Sheet 1 Nov. 20, 1956 K. o. SCHMIDT SEMI-AUTOMATIC PREFETUAL CALENDAR 2 Sheets-Sheet 2 Filed Jan. 24,. 1955 MVP/710p A/UF/ 0/70 55/107/0! I United States Patent SEMI-AUTOMATIC PERPETUAL CALENDAR Karl Otto Schmidt, Idar-Oberstein, Germany Application January 24, 1955, Serial No. 483,515

1 Claim. (Cl. 40-111) Perpetual calendars are known in which the setting of the days of the week and of the month and of the months is eifected by hand separately or is effected simultaneously by the use of comparatively complicated gearing, taking into account irregularity of the number of days in each month and in a year.

The subject of the present invention is a perpetual calendar which with a few simple structural elements provides a convenient daily service while making use of an additional adjustment at the beginning of the month.

In the accompanying drawing illustrating an embodiment of the invention, Fig. 1 is a perspective front view of the calendar and Fig. 2 a perspective rear view. Fig. 3 is a view seen from below of the calendar with its cover omitted. Fig. 4 shows a view of the inside of the right hand wall, Fig. 5 shows a view of the inside of the left hand wall and Fig. 6 is a perspective view of the gearing between the numbers representing the days of the month with the parts separated.

As shown in Figs. 1 and 2 the desk shaped casing 1 of the perpetual calendar has two windows 2, 3 behind which the day of the week and month and the names of the months are visible. The calendar rests on two supports or legs 4, 5. The frame 6 enclosed by the casing (Fig. 3)

carries all the structural parts. It consists of the middle member 7 and two side walls 8, 9 at right angles thereto which are stiffened by strut 10. A spindle 11 is mounted on the side walls 8, 9. On it is loosely mounted a roller 12 indicating the days of the week. It is rigidly connected with a seven-toothed pinion 13 (Fig. 4). The support 4 is located between the pinion and the side wall 8 and is guided in two slots by strut and spindle 11. The supports are pressed outwards by means of spring 14.

Two pins 15, 16 mounted in a suitable position in the support 4 control the setting and stoppage of the roller 12 marked with the days of the week. On pressing on the support 4 in the direction of the arrow 17 against the action of the spring 14 the pin 15 slides along a flank of a tooth and rotates pinion 13 through half a tooth division while pin 16 at the same time releases the pinion. When the support 4 is returned by the spring 14 into inoperative position, the pin 16 turns the pinion 13 through a further half tooth division and again stops pinion 13 and roller 12.

The setting of the units of the days of the month shown on roller 18 is efiected by a similar arrangement by means of support 5 (Fig. 5). The pinion 19 which is corresponding to pinion 13, is provided with ten teeth; it is being rotated and stopped by pins 20 and 21 and is connected by a sleeve 22 with the roller 18.

In Fig. 6 is shown under a the roller 18 with the sleeve 22, on the left hand of which is mounted the ten-toothed pinion 19. Between roller 18 and pinion 19 are located the disc 23 and roller 24 (Fig. 6, b and d). Disc 23 fits with its slot 25 over strut 10 and is thus prevented from rotating. Fig. 6b indicates that side of disc 23 which faces roller 24, Fig. 6c the side facing roller 18.

After each full rotation of the roller 18 the driving member 26 mounted on its inner side engages a tooth of the star wheel 27 which is thereby moved through a quarter of a revolution. The star wheel 27 and the feed wheel. 27 are mounted one at each side of disc 23 on a common axis which is rotatable in a bore in the disc 23. The feed wheel 28 engages through its 8 pins 29 with roller 24. On a complete revolution of roller 18 roller 24 is moved through an eighth of a revolution. As on its periphery the succession of numbers 0 (white), 1, 2, 3 is shown twice it is rotated by a tenth. A blade spring 30 secured to the disc 23 and acting on the pins 29 holds the roller 24 in its position.

The roller 31 (Fig. 3) with the names of the month thereon is mounted together with a toothed wheel 32 on a further axis 34 mounted in the bore 33 (Fig. 3). A blade spring 35 serves to hold it. The wheel 32 is accessible through a slot in the casing from the exterior and is moved monthly by hand.

The operation of the perpetual calendar is as follows:

Starting from the first day of the month pressure is applied once daily to the outer side of the casing as a. result of which supports 4, 5 are pressed inwards and the days of the week and month moved through one division. On each tenth day the roller 24 is also displaced by means of the parts 26 29. At the end of the month by actuating the support 5 several times the necessary new setting can be obtained.

What I claim is:

Inside a semi-automatic desk calendar in desk form, two supports or legs resting on springs movable parallel to their long-axis and provided with two pins each, one of said pins mounted slightly aside from the long axis of said supports, two pinions provided with 7 and 10 teeth respectively adapted to be rotated by said pins one tooth by the up and down movement of said supports and then arrested, two rollers rigidly connected each to one of said pinions and marked respectively with the days of the week and the unit figures; a third roller marked with twice the succession of numbers 0 or blank, 1, 2, 3, rotated by a gear consisting of 8 pins on the inside of said third roller, a

coupling disc, a star wheel and a feed wheel both with four cogs mounted with a common axis eccentrically to the roller axis on said coupling disc, and a projection on the inside of said first-numbered roller; a fourth roller marked with the names of the months and rotatable independently from said three rollers, and spring devices for arresting said third and fourth rollers.

References Cited in the file of this patent UNITED STATES PATENTS 389,212 Fowle Sept. 11, 1888 490,610 Wallin Ian. 24, 1893 490,618 Wallin Jan. 24, 1893 553,427 Rosenfeld Jan. 21, 1896 

